इन्जिनियरिङ सेवा असिस्टेन्ट सब-इन्जिनियर (चौथो तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – असिस्टेन्ट सब-इन्जिनियर (चौथो तह)
Assistant Sub-Engineer – 4th Level · Engineering Service
१,५०३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
प्राविधिक पत्र: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ५ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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Bronze is an alloy of:
सही उत्तर: क) Copper and tin
Bronze is copper alloyed with tin; brass is copper with zinc.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Duralumin, a light and strong alloy used in aircraft and some building fittings, is an alloy of aluminium mainly with:
सही उत्तर: ख) Copper, together with small amounts of magnesium and manganese
Duralumin is an age-hardenable aluminium alloy containing about 4% copper plus small amounts of magnesium and manganese.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Case hardening of steel produces:
सही उत्तर: ग) A hard, wear-resistant surface with a tough, ductile core
Case hardening (e.g. carburising) adds carbon to the surface layer, which is then hardened, while the core stays tough.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Annealing of steel involves:
सही उत्तर: ख) Heating it to a suitable temperature and then cooling it very slowly, to soften it and relieve internal stresses
Slow cooling in annealing produces a soft, ductile structure free from internal stresses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The carbon content of cast iron generally lies in the range of about:
सही उत्तर: घ) 2% to 4.5%
Cast iron contains roughly 2–4.5% carbon, which makes it hard and brittle but good in compression.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which form of iron is the purest, containing the least carbon?
सही उत्तर: क) Wrought iron
Wrought iron is almost pure iron with very low carbon (well below 0.15%); it is tough, malleable and ductile.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fibre saturation point of timber, below which strength and shrinkage begin to change with moisture, is usually about:
सही उत्तर: घ) 25% to 30% moisture content
At the fibre saturation point (about 25–30%), cell walls are saturated but cavities are empty; drying below it causes shrinkage and strength gain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A timber sample weighs 120 g when wet and 100 g after oven drying. Its moisture content (dry basis) is:
सही उत्तर: ख) 20%
Moisture content = (wet − dry)/dry × 100 = (120 − 100)/100 × 100 = 20%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Medullary rays in a tree trunk are:
सही उत्तर: ख) Thin radial strips of cells running from the pith outwards, which hold the fibres together and carry sap horizontally
Medullary rays extend radially from the pith towards the bark, binding the annual rings and transporting food horizontally.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The botanical name of teak, a durable and termite-resistant timber, is:
सही उत्तर: घ) Tectona grandis
Teak is Tectona grandis; Shorea robusta is sal, Dalbergia sissoo is sissoo and Cedrus deodara is deodar.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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